console.log(typeof 'hello');
console.log(typeof 123);
console.log( typeof true);
console.log(typeof undefined);
console.log(typeof Symbol(1));
console.log(typeof 111n);
console.log(typeof null);

console.log(typeof{});
console.log(typeof []);
console.log(typeof new Date());
console.log(typeof function(){});
//函数做了特殊处理









